#include <stdio.h>
void main ()
{
    int p,q ,r ,s ,count =0;
    printf ("The 4 fractions which sum is equal 1 are:\n");
    for(p=2;p<5;p++)
        for(q=p;q<7;q++)
            for(r=q;r<13;r++)
                if(p*q*r-q*r-p*r-p*q!=0)
                {
                    s=(p*q*r)/(p*q*r-q*r-p*r-p*q);
                    if(! ((p*q*r)%(p*q*r-q*r-p*r-p*q))&&s>=r)
                        printf("[%2d]1/%d+1/%d+1/%d+1/%d=1\n",++count,p,q,r,s);
                }
}